debugger;
void function() {
  do break;
  while (typeof delete this);
  for (var a; ; )
    if (true)
      with (null)
        try {
        } catch (a) {
        } finally {
        }
    else throw new 1();

  switch (1 in 1 instanceof 1) {
    case false:
    default:
  }
  return;
};

// or
new (function() {
  do break;
  while (typeof delete this);
  for (var a; void 0; ) continue;
  if (null)
    with (0)
      try {
        switch (1 in 1 instanceof 1) {
          case false:
          default:
            throw true;
        }
      } catch (a) {
      } finally {
      }
  else return; // console.log("测试")
})();
